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Revenues from Contracts with Customers - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]    
Accounts receivable [1] $ 8,928 $ 4,638
Allowance for credit loss $ 74 $ 136
[1] Net of current expected credit loss allowance of $74 as of December 31, 2020 (December 31, 2019 – $136)